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High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
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Photodynamic particle pump in microfluidic systems.

Jiahao Du1, Tingting Yuan2, Xiaotong Zhang3

  • 1Key Lab of In-fiber Integrated Optics, Ministry Education of China, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.

Biomedical Optics Express
|May 5, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel photodynamic particle pump using annular-core hollow-center fiber. This device precisely controls particle velocity in microfluidic systems, offering advancements for cell manipulation and sorting.

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Area of Science:

  • Optics and Photonics
  • Microfluidics
  • Biomedical Engineering

Background:

  • Micro-pumps are essential for controlling liquid flow rates in biomedical equipment like flow cytometry.
  • Precisely controlling particle movement within micro-flow systems containing mixed fluids remains a significant challenge.

Purpose of the Study:

  • To introduce a novel photodynamic particle pump utilizing annular-core hollow-center fiber.
  • To demonstrate effective control over particle velocity in microfluidic systems.

Main Methods:

  • Laser coupling into an annular core via fused tapering optical fiber and welding.
  • Femtosecond laser processing to create microscopic holes for particle injection.
  • Formation of a conical shell light field to accelerate particles.

Main Results:

  • Particle velocity demonstrated a positive correlation with laser power at low injection pressures.
  • Particle flow rate remained independent of injection pressure at constant laser power.
  • Effective control of particle velocity within the micro-flow system was achieved.

Conclusions:

  • The proposed photodynamic particle pump offers a viable solution for particle acceleration control in microfluidic chip systems.
  • This technology holds significant potential for cell manipulation and sorting applications in microbiology.